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Feed horn

About: Feed horn is a research topic. Over the lifetime, 2395 publications have been published within this topic receiving 26548 citations. The topic is also known as: feedhorn.


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Journal ArticleDOI
TL;DR: In this article, a matched feed structure for an offset parabolic reflector antenna is presented, where the feed aperture formed by an intersection of circular and rectangular waveguides provides wide cross-polar bandwidth due to the cutoff wave numbers being close for the two modes used in conjugate matching.
Abstract: This letter presents the details of a novel matched feed structure which promises improved cross-polar performance for an offset parabolic reflector antenna. Feed aperture formed by an intersection of circular and rectangular waveguides provides wide cross-polar bandwidth due to the cutoff wave numbers being close for the two modes used in conjugate matching. The mode coefficients and relative phase difference are estimated using particle swarm optimization (PSO) technique for the specified antenna system. Physical optics (PO) is used to evaluate the reflector pattern; feed radiation pattern is obtained using mode field patterns and cutoff wave numbers, which are computed using 2-D finite element method (FEM). The higher order mode which is combined with the main operating mode of the waveguide for conjugate matching is generated using two posts placed behind the aperture. The antenna system performance is evaluated using HFSS and CST Microwave Studio.

13 citations

01 Jan 2000
TL;DR: The Large Adaptive Reflector (LAR) as discussed by the authors is a concept for a low-cost, large aperture, wideband, radio telescope, designed to operate over the wavelength range from 2 m to 1.4 cm.
Abstract: The Large Adaptive Reflector (LAR) is a concept for a low-cost, large aperture, wideband, radio telescope, designed to operate over the wavelength range from 2 m to 1.4 cm. It consists of a 200-m diameter actuated-surface parabolic reflector with a focal length of 500 m, mounted flat on the ground. The feed is held in place by a tension-structure, consisting of three or more tethers tensioned by the lift of a large, helium-filled aerostat-a stiff structure that effectively resists wind forces. The telescope is steered by simultaneously changing the lengths of the tethers with winches (thus the position of the feed) and by modifying the shape of the reflector. At all times the reflector configuration is that of an offset parabolic antenna, with the capability to point anywhere in the sky above -15° Elevation Angle. At mid-range wavelengths, the feed is a multi-beam prime-focus phased array, about 5 m diameter; at meter wavelengths, it is a single-beam phased array of up to 10 m diameter. Simulations have shown that in operating wind conditions (10 m / s average speed with 2.5 m / s gusts), the position of the feed platform can be stabilized to within a few cm over time scales of -20 s. Research indicates that the telescope concept is feasible and that an order of magnitude improvement in cost per m 2 of collecting area over traditional designs of large parabolic antennas can be achieved.

13 citations

Patent
02 Apr 2003
TL;DR: In this article, a collapsible antenna assembly for portable, outdoor satellite communication systems is provided, which enables the transmission and reception of communications signals from any selected terrestrial location by means of a satellite link.
Abstract: A collapsible antenna assembly for portable, outdoor satellite communication systems is provided. When connected to complementary electronics, the apparatus enables the transmission and reception of communications signals from any selected terrestrial location by means of a satellite link. The apparatus is implemented in a physical form that minimizes the overall physical dimensions such that portability is improved. The apparatus consists of an antenna reflector, transmit assembly, feed horn assembly, a boom, a tripod, and a mounting platform, which permits the antenna reflector to be oriented to operate with any selected satellite. The entire apparatus can be folded and disassembled to fit inside of a suitcase.

13 citations

Patent
01 Jun 1964
TL;DR: In this article, it was shown that a substantial de-coupling is provided between the transmit horn and the receive horn by using sectoral horns instead of pyramidal horns, when a main cylindrical parabolic reflector is used.
Abstract: 1,047,374. Aerials; duplex radio signalling. HUGHES AIRCRAFT CO. May 13, 1965 [June 1, 1964], No. 20241/65. Headings H4A and H4L. In a microwave aerial feed arrangement a flared receive horn contains a coaxial higherfrequency flared transmit horn which projects from its mouth. It is stated that a substantial de-coupling is provided between the transmit horn and the receive horn by this arrangement. As described, a flared pyramidal horn 10 is fed from a transmitter 20 by a waveguide 18 operating in the TE 01 mode and projects from a similar larger receive horn 12 which is connected to a waveguide 22. A receiver 34 is connected to one terminal of a stripline hybrid ring 30 and connections are taken from two other terminals thereof, between which there is a phase difference of 180 degrees, to two probes 26, 28 in the waveguide 22, which is in consequence also caused to operate in the TE 01 mode. The feed arrangement may be associated with a paraboloidal main reflector 38, Fig. 3 (not shown), when the angles of flare of the horns and their dimensions are made such that their phase centres either coincide with the focus of the reflector or, that the phase centres of the transmit and receive horns are on opposite sides of, and small distances from, the focus, with the beam angles of the horns corresponding with the angle subtended by the main reflector at the focus. The feed arrangement may comprise sectoral horns instead of pyramidal horns, when a main cylindrical parabolic reflector may be used.

13 citations

Journal ArticleDOI
TL;DR: In this paper , a dual-polarized horn-like antenna with a radiating aperture that is fed by four smaller waveguides via a quad-furcated junction is presented.
Abstract: A novel compact and highly efficient dual-polarized horn-like antenna is presented. It exploits a radiating aperture that is fed by four smaller waveguides via a quad-furcated junction. The antenna also comprises the full feed network for the feed waveguides including an integrated 4-way orthomode power divider. Design principles are described in detail and illustrated by means of an example involving an antenna with aperture size of 2.6 $\lambda _{0} \times 2.6\lambda _{0}$ ( $\lambda _{0}$ the wavelength at the central frequency of operation) intended primarily for Geostationary Orbit (GEO) satellites. The antenna feed was designed to comply with the Additive Manufacturing rules and exhibits aperture efficiency levels close to the theoretical maximum ones over the entire transmit Ku band (10.7 – 12.75 GHz), while at the same time its profile is highly compact (6.4 $\lambda _{0}$ ). The measured results of a prototype 3D-printed in Selective Laser Melting (SLM) verified experimentally the calculated high aperture efficiency (over 90%). The total antenna feed attains return loss > 19 dB and maximum cross-polarization isolation (XPI) > 24 dB over a bandwidth of 18%. In light of the favorable electrical performances and compact size, the proposed solution constitutes an appealing alternative to profiled (or spline) horns for satellite antenna systems used either as reflector feeds or direct radiating arrays.

13 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202313
202254
202123
202024
201934
201841